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Battery keeps draining even after replacing alternator on 94 gcl 5.2 any ideas

I have replaced alternator checked all fuses and alarm system and still have slow drain on battery --battery is new also. it usually takes about 1-2 days and battery is dead any ideas?

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  • Jeep Master
  • 74,962 Answers

Try this, disconnect the alternator and see if it still drains the alternator, you say new but i know it is rebuilt, and some rebuilders do a terrible job, this is esp true of the so called discount auto parts stores (that is a joke as they often charge more than a dealer) such as O'reilly and others. Buy a Mopar rebuilt if the alternator turns out to be the source of the battery draw down. Also make sure no light inside the truck are on like sun visor lights and so on. Have the battery tested shorted cells cause a draw and will kill the battery overnight, don't over testing new parts as they can be bad, found this out the hard way early in my mechanical career.

Posted on Nov 01, 2012

6 Suggested Answers

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: BATTERY DRAIN

Do you have any stereo equip? Amps? Subs? Aftermarket CD player?

Posted on Dec 19, 2008

motor1258
  • 6674 Answers

SOURCE: slow to fast battery drain problem when engine is off.

If you connect a 12VDC test light in line, between your + battery post & + battery cable,(cable off battery obviously) the light will stay lit brightly as long as there is a draw. Keep in mind your radio will cause some due to memory function, clock etc. Pull stereo/radio fuse to eliminate that draw, then start removing fuses, and putting them back, watch light. If it dims, or goes out, you've found the source of your current draw. I have had to resort to pulling them all,(after making notes for anything I needed to remember about where they were) to get light to go out, then re-installing one by one & watching light. When it comes on nice & bright, note which fuse slot, and pull it back out and continue on, in case of more than one draw.

Posted on Mar 01, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: 2000 Navigator - something draining on battery - goes dead

Hellokrissypoo4...Your navigator has what is known as a parasitic battery drain...meaning, something in the vehicles system is not turning off...here is the way i test for this, you will need a digitial multimeter to perform this test...when doing this test make sure that the dome light, under hood light, trunk light, etc. are OFF.

  1. Remove the negative side battery cable from the negative battery terminal.
  2. Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
  3. If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
  4. Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
  5. Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
  6. Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
  7. Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers

    NOTE:
  8. Some after-market alarm systems may make this test too long or loud to be worth the effort. If that's the case, seek professional help.
  9. In more and more models made after 2003 disconnecting the battery will reset the PCM requiring the modules to relearn. In certain cases this requires a factory scan tool. It is best to take such cars to either the dealer or a professional in auto electrical systems.
  10. Be careful working around the battery in a car
Good luck krissy..i hope this helps..please rate me a fixya.

Posted on Jul 22, 2009

  • 491 Answers

SOURCE: 2005 Dodge Caravan with Dead Battery. Replaced

Disconnect battery from vehicle overnight to check for internal battery drain.......just take one of the cables off.
If the battery is still up and starting the vehicle after being disconnected after a day or two......the drain IS in the vehicle and will have to be checked again.
Do it yourself.
Buy a cheap 12 volt test light.
Place it between the cable you removed before.
One end on the battery post and the other on the cable end.
Now....with the key off......
If the light glows brightly....you have TOO MUCH drain.
We want a dim glowing light.
The dim light is just the memory circuits in the electronics and OK.

With the doors closed....take out one fuse at a time until the light glows dim.......the fuse that dims the light is the problem circuit.
If no fuse dims the light...remove relays one at a time.
Remember....some fuses and relays could be in the engine compartment and under the dash.
If no relay dims the light disconnect ALL alternator wires.
Remember....anything that uses power will make the light glow ....keep those doors closed (we do not want interior light drain affecting the test ) and if you have a under hood light check it first by removing the bulb.
We do not want false readings.

Posted on Sep 22, 2009

  • 580 Answers

SOURCE: 2003 Ford Focus battery light is on, but alternator appears good

Disconnect battery ground for 30 seconds & reconnect. Light should be out unless you have deeper diagnostic problem. Charging system good Battery good. This action should reset trouble light. Good luck!

Posted on Dec 29, 2009

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1 Answer

Battery keeps drainging


Try disconnecting the alternator leads overnight but make sure they are kept away from the body, the big cable is always HOT. See if that does it overnight. If its OK then the alts duff. If not then get a small tester / amp meter set up and connect it between the neg post and the neg lead. This will give you some idea of the drain in amps. With the car locked as normal remove and replace the fuses to lights,door locks etc until the ammeter suddenly reads zero. Then you have an idea of which item is draining it. Door locks are an old favourite after the alternator. Alternators can back drain a batt even if they show a charge when running. Get a pal with electrical knowledge to help.

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Could be the main fuse for the alternator. Its usually large, 80 or 100 amp in size.

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Another thing it does is to shut off your fuel pump. If you get it started after trying the above procedure, the issue is definitely your alarm system.

It is armed whenever you normally leave your car (using power locks seems to arm it on my 94 GCL.

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1 Answer

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